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+// Copyright 2008, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+// * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+// * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+// * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// This is a simple application that stress-tests the crash recovery of the disk
+// cache. The main application starts a copy of itself on a loop, checking the
+// exit code of the child process. When the child dies in an unexpected way,
+// the main application quits.
+
+// The child application has two threads: one to exercise the cache in an
+// infinite loop, and another one to asynchronously kill the process.
+
+#include <windows.h>
+#include <string>
+
+#include "base/logging.h"
+#include "base/message_loop.h"
+#include "base/path_service.h"
+#include "base/string_util.h"
+#include "base/thread.h"
+#include "net/disk_cache/disk_cache.h"
+#include "net/disk_cache/disk_cache_test_util.h"
+
+const int kError = -1;
+const int kExpectedCrash = 1000000;
+
+// Starts a new process.
+int RunSlave(int iteration) {
+ std::wstring exe;
+ PathService::Get(base::FILE_EXE, &exe);
+
+ std::wstring command = StringPrintf(L"%s %d", exe.c_str(), iteration);
+
+ STARTUPINFO startup_info = {0};
+ startup_info.cb = sizeof(startup_info);
+ PROCESS_INFORMATION process_info;
+
+ // I really don't care about this call modifying the string.
+ if (!::CreateProcess(exe.c_str(), const_cast<wchar_t*>(command.c_str()), NULL,
+ NULL, FALSE, 0, NULL, NULL, &startup_info,
+ &process_info)) {
+ printf("Unable to run test\n");
+ return kError;
+ }
+
+ DWORD reason = ::WaitForSingleObject(process_info.hProcess, INFINITE);
+
+ int code;
+ bool ok = ::GetExitCodeProcess(process_info.hProcess,
+ reinterpret_cast<PDWORD>(&code)) ? true :
+ false;
+
+ ::CloseHandle(process_info.hProcess);
+ ::CloseHandle(process_info.hThread);
+
+ if (!ok) {
+ printf("Unable to get return code\n");
+ return kError;
+ }
+
+ return code;
+}
+
+// Main loop for the master process.
+int MasterCode() {
+ for (int i = 0; i < 100000; i++) {
+ int ret = RunSlave(i);
+ if (kExpectedCrash != ret)
+ return ret;
+ }
+
+ printf("More than enough...\n");
+
+ return 0;
+}
+
+// -----------------------------------------------------------------------
+
+// This thread will loop forever, adding and removing entries from the cache.
+// iteration is the current crash cycle, so the entries on the cache are marked
+// to know which instance of the application wrote them.
+void StressTheCache(int iteration) {
+ int cache_size = 0x800000; // 8MB
+ std::wstring path = GetCachePath();
+ path.append(L"_stress");
+ disk_cache::Backend* cache = disk_cache::CreateCacheBackend(path, false,
+ cache_size);
+ if (NULL == cache) {
+ printf("Unable to initialize cache.\n");
+ return;
+ }
+ printf("Iteration %d, initial entries: %d\n", iteration,
+ cache->GetEntryCount());
+
+ int seed = static_cast<int>(Time::Now().ToInternalValue());
+ srand(seed);
+
+ const int kNumKeys = 5000;
+ const int kNumEntries = 30;
+ std::string keys[kNumKeys];
+ disk_cache::Entry* entries[kNumEntries] = {0};
+
+ for (int i = 0; i < kNumKeys; i++) {
+ keys[i] = GenerateKey(true);
+ }
+
+ const int kDataLen = 4000;
+ char data[kDataLen];
+ memset(data, 'k', kDataLen);
+
+ for (int i = 0;; i++) {
+ int slot = rand() % kNumEntries;
+ int key = rand() % kNumKeys;
+
+ if (entries[slot])
+ entries[slot]->Close();
+
+ if (!cache->OpenEntry(keys[key], &entries[slot]))
+ CHECK(cache->CreateEntry(keys[key], &entries[slot]));
+
+ sprintf_s(data, "%d %d", iteration, i);
+ CHECK(kDataLen == entries[slot]->WriteData(0, 0, data, kDataLen, NULL,
+ false));
+
+ if (rand() % 100 > 80) {
+ key = rand() % kNumKeys;
+ cache->DoomEntry(keys[key]);
+ }
+
+ if (!(i % 100))
+ printf("Entries: %d \r", i);
+ }
+}
+
+// We want to prevent the timer thread from killing the process while we are
+// waiting for the debugger to attach.
+bool g_crashing = false;
+
+class CrashTask : public Task {
+ public:
+ CrashTask() {}
+ ~CrashTask() {}
+
+ virtual void Run() {
+ if (g_crashing)
+ return;
+
+ if (rand() % 100 > 1) {
+ printf("sweet death...\n");
+ TerminateProcess(GetCurrentProcess(), kExpectedCrash);
+ }
+ }
+};
+
+// We leak everything here :)
+bool StartCrashThread() {
+ Thread* thread = new Thread("party_crasher");
+ if (!thread->Start())
+ return false;
+
+ // Create a recurrent timer of 10 secs.
+ int timer_delay = 10000;
+ CrashTask* task = new CrashTask();
+ thread->message_loop()->timer_manager()->StartTimer(timer_delay, task, true);
+
+ return true;
+}
+
+void CrashHandler(const std::string& str) {
+ g_crashing = true;
+ __debugbreak();
+}
+
+// -----------------------------------------------------------------------
+
+int main(int argc, const char* argv[]) {
+ if (argc < 2)
+ return MasterCode();
+
+ logging::SetLogAssertHandler(CrashHandler);
+
+ // Some time for the memory manager to flush stuff.
+ Sleep(3000);
+ MessageLoop message_loop;
+
+ char* end;
+ long int iteration = strtol(argv[1], &end, 0);
+
+ if (!StartCrashThread()) {
+ printf("failed to start thread\n");
+ return kError;
+ }
+
+ StressTheCache(iteration);
+ return 0;
+}